eigendash — The notebookhttps://eigendash.comNotes on reliable systems and curious experiments.enHow a convolutional network classifies an imageConvolution, activation, and pooling in the image classifier used by the demo.https://eigendash.com/writing/cnn-explainer/https://eigendash.com/writing/cnn-explainer/Thu, 24 Sep 2026 00:00:00 GMTMachine learningVisual studiesHow the fluid simulation worksVelocity, pressure, and the controls behind the fluid demo.https://eigendash.com/writing/fluid-simulation/https://eigendash.com/writing/fluid-simulation/Thu, 24 Sep 2026 00:00:00 GMTSimulationVisual studiesHow image kernels change a pictureWeighted sums, padding, and the filters used by the convolution demo.https://eigendash.com/writing/image-convolution/https://eigendash.com/writing/image-convolution/Thu, 24 Sep 2026 00:00:00 GMTMachine learningVisual studiesInside a small language modelA walkthrough of the calculations in the small model used by the 3D visualization.https://eigendash.com/writing/llm-visualization/https://eigendash.com/writing/llm-visualization/Thu, 24 Sep 2026 00:00:00 GMTMachine learningVisual studiesHow GPT-2 predicts the next tokenToken embeddings, attention, and sampling in the GPT-2 visualization.https://eigendash.com/writing/transformer-explainer/https://eigendash.com/writing/transformer-explainer/Thu, 24 Sep 2026 00:00:00 GMTMachine learningVisual studiesFive systems ideas worth touchingSmall visual labs for consensus, indexes, embeddings, classifiers, and language-model sampling.https://eigendash.com/writing/interactive-systems-notebook/https://eigendash.com/writing/interactive-systems-notebook/Mon, 21 Sep 2026 00:00:00 GMTInteractiveDistributed systemsDatabasesMachine learningWhat the black-hole image is showing usFrom curved light paths to sparse radio measurements: the geometry and reconstruction behind the EHT image.https://eigendash.com/writing/black-hole-lensing/https://eigendash.com/writing/black-hole-lensing/Sun, 20 Sep 2026 00:00:00 GMTBlack holesWebGLResearchA shrinking vortex and a growing velocityReading OpenAI’s Navier–Stokes construction through its core geometry, energy scaling and smooth forcing.https://eigendash.com/writing/navier-stokes-vortex/https://eigendash.com/writing/navier-stokes-vortex/Sun, 20 Sep 2026 00:00:00 GMTFluid dynamicsWebGLResearchThe art of a boring deploymentDefine rollout gates, preserve schema compatibility, and make rollback a routine operation.https://eigendash.com/writing/boring-deployments/https://eigendash.com/writing/boring-deployments/Sat, 12 Sep 2026 00:00:00 GMTPlatform engineeringKubernetesDevOpsTerraformDistributed systemsCloud infrastructureYour RAG pipeline needs a test setMeasure retrieval recall per question and compare pipeline changes against a versioned evaluation set.https://eigendash.com/writing/rag-evaluation-notebook/https://eigendash.com/writing/rag-evaluation-notebook/Sun, 06 Sep 2026 00:00:00 GMTRAGApplied machine learningLLM systemsAI paper notesEvery millisecond has a storyA Python notebook showing how a small slow cohort changes tail latency while the average stays low.https://eigendash.com/writing/latency-budget/https://eigendash.com/writing/latency-budget/Fri, 28 Aug 2026 00:00:00 GMTPythonMLOpsModel servingAn alert is not an incidentCorrelate alerts without losing source events, clock uncertainty, or the ability to reject a bad grouping.https://eigendash.com/writing/observability-with-context/https://eigendash.com/writing/observability-with-context/Tue, 18 Aug 2026 00:00:00 GMTObservabilityAIOpsBackend engineeringSmall objects, surprising costsMeasure Python object overhead, choose the right storage representation, and account for conversion costs.https://eigendash.com/writing/python-memory/https://eigendash.com/writing/python-memory/Sun, 09 Aug 2026 00:00:00 GMTPython internalsPythonYour architecture rules deserve a linterUse Go’s syntax tree to turn dependency direction, naming rules, and yesterday’s production bug into CI checks.https://eigendash.com/writing/go-architecture-linter/https://eigendash.com/writing/go-architecture-linter/Mon, 03 Aug 2026 00:00:00 GMTGoBackendArchitectureTestingThe platform is a conversationDesign platform defaults around recurring developer tasks, explicit ownership, and measurable recovery.https://eigendash.com/writing/platform-as-product/https://eigendash.com/writing/platform-as-product/Sat, 25 Jul 2026 00:00:00 GMTEngineering leadershipDeveloper experienceA platform can be a library and a well-written manualHow a small SRE team used CDK constructs, operating guides, and guardrails instead of building an internal PaaS.https://eigendash.com/writing/platform-with-cdk/https://eigendash.com/writing/platform-with-cdk/Tue, 17 Mar 2026 00:00:00 GMTPlatform engineeringAWSCDKSREOrganize architecture docs by how fast they go staleSeparate the three-year decisions from next month’s tuning knobs, and the document becomes much easier to trust.https://eigendash.com/writing/architecture-docs-by-time/https://eigendash.com/writing/architecture-docs-by-time/Thu, 04 Sep 2025 00:00:00 GMTArchitectureDocumentationEngineering practiceMCP, ACP, and A2A: which wire connects what?Tool protocols and agent protocols solve different boundaries; the alphabet soup gets easier once the arrows are drawn.https://eigendash.com/writing/agent-protocols/https://eigendash.com/writing/agent-protocols/Thu, 03 Jul 2025 00:00:00 GMTAI agentsMCPProtocolsArchitectureA home lab built from the machines already in the cupboardA practical plan for learning Rust and Kubernetes without pretending the first purchase needs to be a tiny data center.https://eigendash.com/writing/home-development-lab/https://eigendash.com/writing/home-development-lab/Sat, 21 Jun 2025 00:00:00 GMTHome labKubernetesRustLearningA monolith with a BFF brain and a domain heartKeep UI-shaped reads fast and domain-shaped writes honest, without deploying another service for sport.https://eigendash.com/writing/bff-domain-monolith/https://eigendash.com/writing/bff-domain-monolith/Mon, 14 Apr 2025 00:00:00 GMTBackendArchitectureDDDCQRSVision Transformers, without the ceremonial fogHow an image becomes a sequence of patches, and why attention changed the computer-vision toolbox.https://eigendash.com/writing/vision-transformers/https://eigendash.com/writing/vision-transformers/Wed, 05 Mar 2025 00:00:00 GMTComputer visionTransformersMachine learningVLM or vision foundation model? Use the task to decidePhi-3.5 Vision and Florence-2 look similar at the input, but they are built for rather different jobs.https://eigendash.com/writing/vlm-vs-vfm/https://eigendash.com/writing/vlm-vs-vfm/Tue, 24 Dec 2024 00:00:00 GMTComputer visionVLMFoundation modelsMachine learningGenerating Dify workflows with LangGraphA small state machine that writes a workflow, checks its own work, and knows when to ask a human.https://eigendash.com/writing/dify-workflow-generator/https://eigendash.com/writing/dify-workflow-generator/Wed, 27 Nov 2024 00:00:00 GMTAI agentsLangGraphDifyAutomationTurning apartment Wi-Fi into a site-to-site VPNA Raspberry Pi, WireGuard, and one mildly hostile captive portal walk into an apartment network.https://eigendash.com/writing/raspberry-pi-site-vpn/https://eigendash.com/writing/raspberry-pi-site-vpn/Thu, 18 Jan 2024 00:00:00 GMTHome labNetworkingWireGuardRaspberry Pi